On 2/19/21 9:02 AM, Thomas Seeling wrote:
Hallo,
is it possible to query the "breadcrumb" of a grub boot process?
Is there a query function that I can use to find out how my system got
bootstrapped?
Use a single boot partition and install grub to use that.
I can understand the rationale and the bigger picture for the recommendation
but I'd like to better understand the inner workings of grub.
This is the main reason why I asked.
I'm doing devops for lots of machines where I can't change the boot layout (big
company, policies, governance etc.).
Most of them really have 2 partitions (similar to the concept of Android A/B
emmc layout).
I want to find out the boot process breadcrumb to be sure where things are
getting installed to.
The problem is the way grub finds it's cfg file and modules. If the
systems use msdos partition tables, the location is buried in the first
31.5 KB of raw disk sectors. If it is using GPT, it is in the BIOS boot
partition which is usually a 1 MB raw/unformatted partition.
I believe there is a capability to set a chainloader in the default cfg
file. See
https://www.gnu.org/software/grub/manual/grub/html_node/Chain_002dloading.html,
but I've never used it.
-- Bruce
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